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Configuring IP FRR for VPN Routes

Configuring IP FRR for VPN Routes

Pre-configuration Tasks

Before configuring
IP FRR for VPN routes, complete the following tasks:

Ensure that the PE has learned VPN routes with the same prefix
from the attached CE devices.

Context

IP FRR for VPN routes is used in scenarios where multiple
CE devices connect to one PE device. As shown in Figure 3-42, the PE
device forwards data to the site of vpn1 through Link_A, and Link_B
is a backup link. When the PE device detects that the route to CE1
is unreachable, it immediately switches traffic to Link_B and then
performs other operations to trigger VPN route convergence. This minimizes
impact of the link failure on VPN services.

Figure 3-42 IP FRR for VPN routes

Perform the following configuration on a
PE device that connects to multiple CE devices.

Procedure

configuring IP FRR

Run:

system-view

The system view is displayed.

Run:

route-policyroute-policy-name { permit | deny } nodenode

A node is configured for a route-policy, and the route-policy
view is displayed.

Run:

apply backup-interfaceinterface-typeinterface-number

A backup outbound interface is specified.

(Optional) Run:

apply backup-nexthopip-address

A backup next hop
is specified.

Run:

quit

Return to the system view.

Run:

ip vpn-instancevpn-instance-name

The VPN instance
view is displayed.

Run:

ipv4-family

The VPN instance IPv4 address family view is displayed.

Run:

ip frrroute-policyroute-policy-name

IP FRR is enabled for the VPN instance IPv4 address family.

Checking the Configuration

Run the display
ip routing-tablevpn-instancevpn-instance-name [ ipv4-address ] verbose command to check the backup
next hops and backup outbound interfaces of VPN-IPv4 routes in the
routing table.